CN109626557B - Membrane bioreactor capable of automatically adjusting MLSS concentration - Google Patents
Membrane bioreactor capable of automatically adjusting MLSS concentration Download PDFInfo
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- CN109626557B CN109626557B CN201811557529.8A CN201811557529A CN109626557B CN 109626557 B CN109626557 B CN 109626557B CN 201811557529 A CN201811557529 A CN 201811557529A CN 109626557 B CN109626557 B CN 109626557B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Activated Sludge Processes (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a membrane bioreactor capable of automatically regulating MLSS concentration, which comprises a membrane pond and a water inlet system, wherein the membrane pond comprises a reaction area and a sludge area, the water inlet system comprises a main water inlet pipe, a three-way flow control valve, a reaction division water inlet pipe, a sludge division water inlet pipe, a controller and an MLSS sensor, the MLSS sensor is arranged in the membrane pond, a water outlet of the main water inlet pipe is respectively connected with a water inlet of the reaction division water inlet pipe and a water inlet of the sludge division water inlet pipe through the three-way flow control valve, a water outlet of the reaction division water inlet pipe is connected with the reaction area of the membrane pond, a water outlet of the sludge division water inlet pipe is connected with the sludge area of the membrane pond, and the controller is respectively and electrically connected with the MLSS sensor and the three-way flow control valve. The beneficial effects of the invention are as follows: on the basis of not increasing extra energy consumption, the concentration of MLSS in the membrane pool is kept constant.
Description
Technical Field
The invention relates to a membrane bioreactor, in particular to a membrane bioreactor capable of automatically adjusting the concentration of MLSS.
Background
The membrane bioreactor has more and more application in drinking water and sewage treatment, and can combine biodegradation and physical separation of the membrane to realize separate control of microorganism residence time and hydraulic residence time. In order to increase the treatment efficiency of the membrane bioreactor, a method for increasing the number of microorganisms in the reactor is generally adopted to strengthen the removal effect on pollutants. The MLSS concentration (mixed liquor suspended solid concentration, mixed liquid suspended solids) in the membrane bioreactor is usually maintained at about 8000 to 10000 mg/L. However, the membrane bioreactor adopts a membrane filtration process, so that the process integration level is high, the membrane bioreactor is generally applied to the situation of limited places, and a large regulating tank cannot be arranged. Therefore, the membrane filtration has a weak buffer capacity for water, and is liable to cause a change in the concentration of MLSS in the reactor. The change in the MLSS concentration in the reactor can affect the effluent quality and even cause the failure of the reactor, requiring the re-cultivation of microorganisms. In order to maintain the activity and stability of microorganisms in the reactor, a filler is generally added to provide carriers for the microorganisms, and a method of impacting bottom sludge by using pulse water flow is also used for controlling the concentration of MLSS.
In the prior art, the scheme for controlling the concentration of MLSS mainly comprises: 1. adopt the sewage treatment system of MBR membrane module, publication No. CN106957107A, through a plurality of pulse water distribution pipes that are located in the facultative tank, aerate and stir facultative tank bottom mud in MBR membrane module bottom, realize MLSS concentration control. 2. An MBR integrated device for slowing down membrane pollution, publication No. CN107311394A, which is characterized in that a sludge sedimentation area and an inclined tube sedimentation device are arranged at the bottom of a reaction tank, and the sludge is refluxed after sedimentation, so as to control the concentration of MLSS. 3. A composite energy-saving and consumption-reducing MBR sewage treatment system is disclosed as a publication No. CN106698653A, wherein an inclined plate sedimentation tank is added in front of a membrane tank, and the concentration of MLSS in the membrane tank is controlled in a reflux mode. The above publications mainly realize the regulation of the MLSS concentration by means of hydraulic pulse, sludge reflux and the like. Besides the method of directly regulating the concentration of MLSS, a method of adding filler is also adopted to change the concentration of microorganisms, for example, a membrane bioreactor system for researching improvement of membrane pollution by the filler, a quantitative test method and application are adopted, the publication No. CN 102642920B is entitled, a novel method for controlling membrane pollution in a membrane bioreactor, the publication No. CN 102276055A is entitled, a flat ceramic ultrafiltration membrane bioreactor is entitled, and the publication No. CN 103304021A is adopted, wherein the filler is arranged in a membrane tank, so that microbial flocs are attached to the surface of the biological filler, and the microbial load can be increased, and the membrane pollution can be relieved.
Based on the above discussion, existing methods and apparatus improve the microorganism concentration in a membrane pond by hydraulic agitation, gas agitation, sludge recirculation, and packing media, while enabling the regulation of MLSS concentration, all require additional energy consumption.
Therefore, how to realize the adjustment of the MLSS concentration without increasing additional energy consumption is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a membrane bioreactor capable of automatically adjusting the concentration of MLSS.
The invention provides a membrane bioreactor capable of automatically regulating MLSS concentration, which comprises a membrane pond and a water inlet system, wherein the membrane pond comprises a reaction area and a sludge area, the water inlet system comprises a main water inlet pipe, a three-way flow control valve, a reaction distinguishing water inlet pipe, a sludge distinguishing water inlet pipe, a controller and an MLSS sensor, the MLSS sensor is arranged in the membrane pond, a water outlet of the main water inlet pipe is respectively connected with a water inlet of the reaction distinguishing water inlet pipe and a water inlet of the sludge distinguishing water inlet pipe through the three-way flow control valve, a water outlet of the reaction distinguishing water inlet pipe is connected with the reaction area of the membrane pond, a water outlet of the sludge distinguishing water inlet pipe is electrically connected with the sludge area of the membrane pond, the controller is respectively connected with the MLSS sensor and the three-way flow control valve, the MLSS sensor is used for detecting the SS concentration in the membrane pond and feeding back to the controller, and the controller is used for comparing the detected MLSS concentration with a set value and controlling the three-way flow control valve based on a comparison result so as to control the flow of the reaction distinguishing water inlet pipe and the sludge.
As a further improvement of the invention, a membrane component is arranged in the reaction zone of the membrane tank, the membrane component is connected with a suction device through a water production pipeline, the MLSS sensor is fixed on the inner wall of the reaction zone of the membrane tank, and the controller is a PLC controller.
As a further improvement of the invention, an aeration device is arranged in the reaction zone of the membrane tank, and the aeration device is connected with a gas pipeline.
As a further improvement of the invention, the aeration device is positioned right below the membrane component, and the membrane component is a flat ceramic membrane.
As a further improvement of the invention, the reaction zone water inlet pipe is connected with a coagulant adding pipe, and the coagulant adding pipe is connected with a coagulant adding pump.
As a further improvement of the invention, the reaction zone is positioned at the top of the membrane tank, and the sludge zone is positioned at the bottom of the membrane tank.
As a further improvement of the invention, a membrane tank baffle plate is arranged at the bottom of the membrane tank, the membrane tank baffle plate divides the membrane tank into the reaction zone and the sludge zone, and the membrane tank baffle plate is a net-shaped baffle plate.
As a further improvement of the invention, a sludge partition plate which is obliquely arranged is arranged in the sludge zone of the membrane tank, the sludge partition plate divides the sludge zone into a sludge I zone and a sludge II zone, and the bottom of the sludge II zone is connected with a sludge discharge valve.
As a further improvement of the invention, the sludge dividing water inlet pipe is connected with a perforated water distribution pipe, and the perforated water distribution pipe is positioned at the bottom of the sludge I area, is horizontally arranged in a ring shape and is not contacted with the sludge partition plate.
As a further improvement of the invention, the upper part of the perforated water distribution pipe is provided with a plurality of water outlets which are distributed at equal intervals, the sludge partition plate is arranged in a pyramid shape, and the center of the bottom of the sludge I area is provided with a square sludge collecting opening.
The beneficial effects of the invention are as follows: through the scheme, on the basis of not increasing extra energy consumption, the MLSS concentration in the membrane tank can be detected in real time through the MLSS sensor, and when the MLSS concentration acquired by the MLSS sensor is lower than a set value, the controller can be used for controlling the three-way flow control valve so as to increase the flow of the sludge distinguishing water inlet pipe, reduce the sedimentation of the sludge and keep the MLSS concentration in the membrane tank constant; in contrast, if the MLSS concentration obtained by the MLSS sensor is higher than the set value, the controller can control the three-way flow control valve to increase the flow rate of the reaction differentiation water inlet pipe, so that the MLSS concentration in the membrane tank is kept constant.
Drawings
FIG. 1 is a schematic diagram of a membrane bioreactor for automatically regulating the concentration of MLSS according to the present invention.
Fig. 2 is a cross-sectional view A-A of fig. 1.
Detailed Description
The invention is further described with reference to the following description of the drawings and detailed description.
As shown in fig. 1 to 2, the membrane bioreactor capable of automatically adjusting the concentration of MLSS comprises a membrane tank 1 and a water inlet system, wherein the membrane tank 1 comprises a reaction zone 101 and a sludge zone 102, the water inlet system comprises a main water inlet pipe 2, a three-way flow control valve 23 capable of adjusting flow, a reaction distinguishing water inlet pipe 21, a sludge distinguishing water inlet pipe 22, a controller 5 and an MLSS sensor 16, the MLSS sensor 16 is arranged in the membrane tank 1, a water outlet of the main water inlet pipe 2 is respectively connected with a water inlet of the reaction distinguishing water inlet pipe 21 and a water inlet of the sludge distinguishing water inlet pipe 22 through the three-way flow control valve 23, a water outlet of the reaction distinguishing water inlet pipe 21 is connected with the reaction zone 101 of the membrane tank 1, a water outlet of the sludge distinguishing water inlet pipe 22 is electrically connected with the sludge zone 102 of the membrane tank 1, the controller 5 is respectively connected with the MLSS sensor 16 and the three-way flow control valve 23, the MLSS sensor 16, the controller 5, the three-way flow control valve 23, the reaction distinguishing water inlet pipe 21 and the sludge distinguishing water inlet pipe 22 form a closed-loop control system, the MLSS sensor 16 is used for controlling the concentration of the MLSS sensor 1 and the concentration of the MLSS sensor is controlled by the three-way flow control valve 5, and the concentration of the sludge is compared with the sludge distinguishing water inlet pipe 22, and the concentration is finally controlled by the concentration of the sludge distinguishing water inlet pipe 1 and the concentration is controlled by the concentration of the sludge distinguishing water inlet pipe 1.
As shown in fig. 1 to 2, the reaction zone water inlet pipe 21 is connected with the water inlet at the top of the membrane tank 1, and the sludge zone water inlet pipe 22 enters the sludge zone 102 at the bottom of the membrane tank.
As shown in fig. 1 to 2, a membrane module 4 is disposed in the reaction area 101 of the membrane tank 1, the membrane module 4 is connected with a suction device 41 through a water production pipeline 42, the MLSS sensor 16 is fixed on the inner wall within the range of the reaction area 101 of the membrane tank 1, the controller 5 is preferably a PLC controller, the suction device 41 is preferably a suction pump, and the suction pump can be used as a water production pump and a recoil pump at the same time.
As shown in fig. 1 to 2, an aeration device 14 is disposed in the reaction area 101 of the membrane tank 1, the aeration device 14 is connected with a gas pipeline 15, the membrane bioreactor can perform ozone, pure oxygen or ozone/pure oxygen mixed aeration, the membrane tank 1, the membrane module 4 and the aeration device 14 are made of ozone oxidation resistant materials, such as 316L stainless steel, polytetrafluoroethylene and the like, and the membrane tank 1, the membrane module 4 and the aeration device 14 can resist ozone oxidation.
As shown in fig. 1 to 2, the aeration device 14 is located directly below the membrane assembly 4, the membrane assembly 4 is preferably a flat ceramic membrane, the membrane assembly 4 is a high-strength flat ceramic membrane, and can cope with particulate scraping and water flushing, and the service life is about 15 years.
As shown in fig. 1 to 2, the reaction area water inlet pipe 21 is connected with a coagulant adding pipe 31, the coagulant adding pipe 31 is connected with a coagulant adding pump 3, the coagulant is added into the reaction area water inlet pipe 21, and the coagulation process is completed in the reaction area water inlet pipe 21 and in the membrane tank 1.
As shown in fig. 1 to 2, the reaction zone 101 is located at the top of the membrane tank 1, and the sludge zone 102 is located at the bottom of the membrane tank 1.
As shown in fig. 1 to 2, a membrane tank partition 11 is disposed at the bottom of the membrane tank 1, the membrane tank partition 11 divides the membrane tank 1 into a reaction zone 101 and a sludge zone 102, the membrane tank partition 11 is preferably a mesh partition, and the membrane tank partition 11 can separate the reaction zone 101 from the sludge zone 102 and rectify the inflow water of the sludge zone water inlet pipe 22 so that the inflow water uniformly enters the reaction zone 101.
As shown in fig. 1 to 2, a sludge partition plate 12 is disposed in a sludge area 102 of the membrane tank 1, the sludge partition plate 12 divides the sludge area 102 into a sludge i area 1021 and a sludge ii area 1022, the sludge ii area 1022 is located below the sludge i area 1021, a sludge discharge valve is connected to the bottom of the sludge ii area 1022, the sludge in the sludge i area 1021 can reenter a reaction area 101 of the membrane tank 1 under the pushing of water flow, and the water flow pushing force is derived from a perforated water distribution pipe 24. The sludge in the sludge II area 1022 is surplus sludge, cannot enter the membrane tank 1 again, and finally is discharged out of the system through the sludge discharge valve 13.
As shown in fig. 1 to 2, the sludge dividing water inlet pipe 22 is connected with a perforated water distribution pipe 24, and the perforated water distribution pipe 24 is positioned at the bottom of the sludge i-zone 1021, is horizontally arranged in a ring shape, and is not in contact with the sludge partition 12.
As shown in fig. 1 to 2, the perforated water distribution pipe 24 has a plurality of water outlets at an equal distance, the sludge separator 12 is arranged in a pyramid (i.e. V-shaped cross section), and a square sludge collection opening is provided at the center of the bottom of the sludge i-zone 1021.
According to the membrane bioreactor capable of automatically adjusting the MLSS concentration, the MLSS concentration in the membrane pond 1 can be detected in real time through the MLSS sensor 16, when the MLSS concentration obtained by the MLSS sensor 16 is lower than a set value, the controller 5 can be used for controlling the three-way flow control valve 23 so as to increase the flow of the sludge distinguishing water inlet pipe 22, reduce the sedimentation of the sludge and keep the MLSS concentration in the membrane pond 1 constant; in contrast, if the MLSS concentration obtained by the MLSS sensor 16 is higher than the set value, the three-way flow control valve 23 may be controlled by the controller 5 to increase the flow rate of the reaction-discriminating water inlet pipe 21, thereby keeping the MLSS concentration in the membrane tank 1 constant.
The membrane bioreactor capable of automatically adjusting the MLSS concentration provided by the invention belongs to the field of water and wastewater treatment, and can automatically adjust the MLSS concentration in the reactor, realize preliminary adsorption and biodegradation of pollutants and control sludge age, so that removal of particles, ammonia nitrogen, organic matters and trace pollution in water is stably realized, and the membrane bioreactor is suitable for drinking water treatment and wastewater treatment, and does not need to increase extra energy consumption.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (8)
1. A membrane bioreactor capable of automatically adjusting the concentration of MLSS, which is characterized in that: including membrane pond and water inlet system, the membrane pond includes reaction zone and mud district, water inlet system includes main inlet tube, tee bend flow control valve, reaction zone inlet tube, mud zone inlet tube, controller and MLSS sensor, MLSS sensor sets up in the membrane pond, the delivery port of main inlet tube pass through tee bend flow control valve respectively with the water inlet of reaction zone inlet tube, the water inlet of mud zone inlet tube are connected, the delivery port of reaction zone inlet tube with the reaction zone of membrane pond is connected, the delivery port of mud zone inlet tube with the mud zone of membrane pond is connected, the controller respectively with MLSS sensor, tee bend flow control valve electricity is connected, MLSS sensor is used for detecting the MLSS concentration in the membrane pond and feedback to the controller, the MLSS concentration that then will detect compares with the setting, and based on the comparison result control tee bend flow control valve to control reaction zone inlet tube, mud zone are located the top of membrane pond, the reaction zone is located the membrane zone of membrane pond, the membrane is equipped with the membrane bottom of membrane pond, the membrane baffle is divided into the membrane pond.
2. The membrane bioreactor for automatically adjusting MLSS concentration according to claim 1, wherein: the reaction zone of the membrane pool is internally provided with a membrane component, the membrane component is connected with a suction device through a water production pipeline, the MLSS sensor is fixed on the inner wall of the reaction zone range of the membrane pool, and the controller is a PLC controller.
3. The membrane bioreactor for automatically adjusting the concentration of MLSS according to claim 2, wherein: an aeration device is arranged in the reaction zone of the membrane tank, and the aeration device is connected with a gas pipeline.
4. A membrane bioreactor for automatically adjusting MLSS concentration as claimed in claim 3, wherein: the aeration device is positioned under the membrane component, and the membrane component is a flat ceramic membrane.
5. The membrane bioreactor for automatically adjusting MLSS concentration according to claim 1, wherein: the reaction zone water inlet pipe is connected with a coagulant adding pipe, and the coagulant adding pipe is connected with a coagulant adding pump.
6. The membrane bioreactor for automatically adjusting MLSS concentration according to claim 1, wherein: the sludge zone of the membrane tank is internally provided with a sludge baffle plate which is obliquely arranged, the sludge baffle plate divides the sludge zone into a sludge zone I and a sludge zone II, and the bottom of the sludge zone II is connected with a sludge discharge valve.
7. The membrane bioreactor for automatically adjusting the concentration of MLSS as claimed in claim 6, wherein: the sludge separation water inlet pipe is connected with a perforated water distribution pipe, and the perforated water distribution pipe is positioned at the bottom of the sludge I region, is horizontally arranged in a ring shape and is not contacted with the sludge partition plate.
8. The membrane bioreactor for automatically adjusting the concentration of MLSS as claimed in claim 7, wherein: the upper portion of perforation water distribution pipe is equipped with a plurality of equidistance distribution's apopores, the mud baffle is the pyramid setting, the central authorities of the bottom in mud I district are provided with square mud collection opening.
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| CN201811557529.8A CN109626557B (en) | 2018-12-19 | 2018-12-19 | Membrane bioreactor capable of automatically adjusting MLSS concentration |
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| CN110550754B (en) * | 2019-09-24 | 2022-04-01 | 浙江联池水务设备股份有限公司 | Membrane method sewage treatment system |
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| JPS62269799A (en) * | 1986-05-16 | 1987-11-24 | Meidensha Electric Mfg Co Ltd | Control device for amount of return sludge |
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